Sure, here's a simple game where you can pick up a gun and shoot zombies using pictograms.
This game sets up a canvas where you control a player represented by a blue rectangle. There is a gun represented by a red rectangle randomly placed on the screen. Once you touch the gun, you can then touch the green zombie rectangle to shoot it. If you successfully touch the zombie with the gun, an alert message will appear indicating that you killed the zombie. The zombie moves randomly around the screen.